mikemccand commented on issue #15079:
URL: https://github.com/apache/lucene/issues/15079#issuecomment-3233930945

   > I did not see much changes since Aug 21th all looks stable, so I don't 
think the segment trafces (using infostream) is really affecting indexin 
performance.
   
   +1, that is a nice outcome (and agrees with past results).  InfoStream logs 
are super helpful for debugging indexing issues using [segment 
tracing](https://githubsearch.mikemccandless.com/long-segments.html).
   
   > To me it looks like we are hunting ghosts.
   
   I think this is likely.  Another couple datapoints and no change.  But it's 
so annoying for a ghost to decide to appear RIGHT THEN when we merge 
`GroupVarInt`.  Who knows, it could be something crazy like `GroupVarInt` made 
merging faster, so this massive backlog of merges finished faster and kicked 
off further / harder merges, tweaking CPU/IO on the threads doing indexing.


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